I have Maggie MG 1.6's - need amp advice

No Doubt!! Clipping any large amp will eat tweeters pretty fast.

Although tube amps do have more THD in general, the idea is to generate less of the distortions the ear *objects* to, and tubes are quite good at that. This goes back to that 'tube power' 'transistor power' debate (personally to me watts is watts so I use the idea of 'usable power' instead of tube/transistor power- the idea conveys easier).

That's one nice advantage of bi-amping. You can have a nice sweet tube amp (like an AtmaSphere M60/w. Zero's) on the tweeter panel, and use a big honking high current solid state amp on the bass panel.

Check out this article from TNT-Audio that discusses the issues around crossovers that can be addressed by actively amplifying your speaker:

http://www.tnt-audio.com/casse/active_speakers_intro1_e.html
http://www.tnt-audio.com/casse/active_speakers_intro2_e.html

Hope this helps!

One person mentions them above, but a 2nd plug for Pass Labs. If you can find a used Aleph what you get per dollar spent is very hard to beat. Stereophile showed that these perform super well into amazingly low ohm loads. They provide serious current and the Aleph line purchased used may be cheap enough to run bi-amped at the high wattage levels. For real fun, get 4 monoblocks bi-wired. Price would keep most from doing that with new amps of similar quality... 4 Aleph 1's into 1.6s would put power issues to rest quite quickly!! Right now there are indeed 4 Aleph 0's for sale here - not nearly as powerful, but with 4 amps at those prices, would be awesome.